[necro5.0]

Has anyone here ever done a fuel injection to carb swap on a foxbody? what all does it require? Will the intake/carb/air cleaner combo fit under the stock hood? what vaccuum lines and other sensors would i have to bypass or delete?

[RDY4WAR]

I'm in the process of doing a carb conversion.

What you're going to need to do is get rid of the MAF, the fuel rails, fuel injectors, the obvious stuff. Get rid of the engine harness and ECU as it'll be useless and dead weight. Remove the electronic distributor and everything from the lower intake manifold up. So long as you get a short intake manifold, you shouldn't have problems with hood clearance. If you do, then get convertible engine mounts and the engine will sit lower. Here's a list of what you'll need,

-Intake Manifold for Carb
-Carburater (600 is good for stock-ish motor)
-You can use the OEM fuel pump just use a really good FPR with a return line to the tank as a carb only requires 6-8psi fuel pressure
-Block off the EGR completely (Did I say that out loud?)
-Find nuts to plug the O2 bungs
-Find a distributor with vacuum advance since you will be deleting the ECU
-Get a duraspark or MSD ignition box
-Get a air cleaner for carb
-Find a 1985 or earlier GT and grab the throttle cable for carb as well as fuel hardlines to the FPR

This is what I'm doing, you might do it differently, but I'm wiring my fuel pump, ignitions, and electric fan into a switch board so I can just turn them on when I want to start the car. If I've forgotten anything I'll let you know, but that's about it. If you could find a 1985 or earlier donor car, that would be best since you'd have everything right there. Another way you could deal with the fuel pressure issue would be to drop the tank and swap it with a tank from a pre-1985 GT for the pull through fuel line, and then hook up an electric fuel pump for about 8psi. I personally think the FPR route would be much easier and less hassle, it's the route I'm going.

You can still use the same roller cam, same heads, bottom end, etc... nothing there has to change.

[necro5.0]

Originally Posted by smithboy76908 I'm in the process of doing a carb conversion. What you're going to need to do is get rid of the MAF, the fuel rails, fuel injectors, the obvious stuff. Here's a list of what you'll need, -Intake Manifold for Carb -Carburater (600 is good for stock-ish motor) -You can use the OEM fuel pump just use a really good FPR with a return line to the tank as a carb only requires 6-8psi fuel pressure -Block off the EGR completely (Did I say that out loud?) -Find nuts to plug the O2 bungs -Find a distributor with vacuum advance since you will be deleting the ECU -Get a duraspark or MSD ignition box -Get a air cleaner for carb -Find a 1985 or earlier GT and grab the throttle cable for carb as well as fuel hardlines to the FPR This is what I'm doing, you might do it differently, but I'm wiring my fuel pump, ignitions, and electric fan into a switch board so I can just turn them on when I want to start the car. If I've forgotten anything I'll let you know, but that's about it.

Thanks for the info, let me know of any headaches that you experience with your swap, if i end up doing a swap on my car i'm gonna have to be able to get it completely done over the course of the weekend so i can drive to work on monday.

[F8L GT]

Originally Posted by smithboy76908 I'm in the process of doing a carb conversion. What you're going to need to do is get rid of the MAF, the fuel rails, fuel injectors, the obvious stuff. Get rid of the engine harness and ECU as it'll be useless and dead weight. Remove the electronic distributor and everything from the lower intake manifold up. So long as you get a short intake manifold, you shouldn't have problems with hood clearance. If you do, then get convertible engine mounts and sit the engine lower. Here's a list of what you'll need, -Intake Manifold for Carb -Carburater (600 is good for stock-ish motor) -You can use the OEM fuel pump just use a really good FPR with a return line to the tank as a carb only requires 6-8psi fuel pressure -Block off the EGR completely (Did I say that out loud?) -Find nuts to plug the O2 bungs -Find a distributor with vacuum advance since you will be deleting the ECU -Get a duraspark or MSD ignition box -Get a air cleaner for carb -Find a 1985 or earlier GT and grab the throttle cable for carb as well as fuel hardlines to the FPR This is what I'm doing, you might do it differently, but I'm wiring my fuel pump, ignitions, and electric fan into a switch board so I can just turn them on when I want to start the car. If I've forgotten anything I'll let you know, but that's about it.

Ive always done mine using the stock ignition but this list just about sums it all up

[RDY4WAR]

Originally Posted by F8L GT Ive always done mine using the stock ignition but this list just about sums it all up

Really? I didn't think you could since the ECU controls spark advance and so forth. I know you can use the stock ignitions, just set the timing at a steady advance where it's at like 35-36* advancement all the time, even at idle. You just won't have any advancement. I'll look more into that.

[RDY4WAR]

Originally Posted by necro5.0 Thanks for the info, let me know of any headaches that you experience with your swap, if i end up doing a swap on my car i'm gonna have to be able to get it completely done over the course of the weekend so i can drive to work on monday.

I'll keep you updated. I'm probably going to start a build thread here soon. I would try to find the time when you have at least a week off. While it could be done in 3-4 days, you want to leave room for error and then a day or so for tuning and break in. What happens if a bolt get's stripped on the intake manifold and you have to wait until Monday to get another one, you're kinda out of luck. Not to mention you'll have to run wiring for the fan, ignitions, and fuel pump and while that's not difficult, it can be time consuming.

For the FPR, Mallory makes a really good one that is common for this conversion. Summit Racing has it for $89.99 I think.

[F8L GT]

, has always worked for me, the only wires left in the harness are oi, press, water temp, coil, and the ones going to the module on the distributor. Granted this is in my truck but they are basically the same set up

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[RDY4WAR]

Are you still getting spark advance? This goes against everything I've ever known! lol

[F8L GT]

yeah, never had any troubles with it. Use it for towing my car to the track and as a DD. eventually I will be putting a street fire ignition in it but until then, this works for me

[RDY4WAR]

.....I'm definitely going to look into that! It could save me the time, effort, and money of converting the ignitions. Thanks, good input.

[F8L GT]

the correct way is to put a new ignition in. I only did mine this way because i need it back on the road.

[RDY4WAR]

Ok gotcha! It's definitely got me thinking.

[necro5.0]

Originally Posted by F8L GT Ive always done mine using the stock ignition but this list just about sums it all up

I have an msd pro billet distributor, wouldn't i be able to reuse that with a carb set up?

[fateisajester]

ive done it... it was pretty straightforward. and i did it all for free. I sold all my efi stuff for $500 and used that money for the conversion. when i first did it, I started with points ignition, just because i had an old points dizzy laying around. also, i found a holley blue pump on cl for like $75 that came with a regulator. i just pulled out the stock pump, and put some fuel line in its place. i used all the old fuel lines that were already in my car. Id say that all in all, it was fairly simple. took me about 9 beers to get it done.(i dont measure car work in "time"... just beers lol)

[necro5.0]

Originally Posted by fateisajester ive done it... it was pretty straightforward. and i did it all for free. I sold all my efi stuff for $500 and used that money for the conversion. when i first did it, I started with points ignition, just because i had an old points dizzy laying around. also, i found a holley blue pump on cl for like $75 that came with a regulator. i just pulled out the stock pump, and put some fuel line in its place. i used all the old fuel lines that were already in my car. Id say that all in all, it was fairly simple. took me about 9 beers to get it done.(i dont measure car work in "time"... just beers lol)

Awesome! how come you did a swap on your car? and do you like it better now that it's carbed?

[ryans88gt]

Originally Posted by necro5.0 I have an msd pro billet distributor, wouldn't i be able to reuse that with a carb set up?

you can, but you'll have to lock out the timing.

It'd be better to sell it and pick up a mechanical advance or vacuum/mechanical advance dizzy.

[fateisajester]

Originally Posted by necro5.0 Awesome! how come you did a swap on your car? and do you like it better now that it's carbed?

well i grew up with older car that my dad was always working on. so i know carbs. i tried the whole efi thing for about 6 months on my mustang, and had constant problems out of it.

since i put on the carb, i couldnt be happier.

but just remember that once you go carb, your car wont be worth as much any more. no one wants a carbed stang unless its putting down some serious numbers

[necro5.0]

Originally Posted by fateisajester well i grew up with older car that my dad was always working on. so i know carbs. i tried the whole efi thing for about 6 months on my mustang, and had constant problems out of it. since i put on the carb, i couldnt be happier. but just remember that once you go carb, your car wont be worth as much any more. no one wants a carbed stang unless its putting down some serious numbers

Thanks! I just want my car to run right, I'm $400 dollars into a tune up and it still doesn't run correctly.

[fastback lover]

Good luck on this build. Let me know how it goes. Thank you. Also great info for those who want to do this.

[gotn20]

You guys are crazy. I had a four eyes and the first thing I did was convert it to efi